Memory Prefix, Suffix & Root MatchVersion en ligne Learn how prefixes, suffixes, and roots modify meaning. par Xadicha Abdusattorova Root meaning: to do or perform. Negation; opposite of the base word. act Root meaning: to look or see. -ing Again or back; repeat action. -ly Past tense; action completed. spect Present participle; ongoing action. -er Suffix turning adjectives into adverbs. Suffix for a person or thing that performs un- -ed re-